EP 1153263 A1 20011114 - COMBINING INTERFERENCE FRINGE PATTERNS TO A MOIRE FRINGE PATTERN
Title (en)
COMBINING INTERFERENCE FRINGE PATTERNS TO A MOIRE FRINGE PATTERN
Title (de)
KOMBINATION VON INTERFERENZLINIENBILDERN ZU EINEM MOIRE BILD
Title (fr)
COMBINAISON DE DIAGRAMMES DE FRANGES D'INTERFERENCE A DES DIAGRAMMES DE FRANGES DE MOIRE
Publication
Application
Priority
- GB 0000236 W 20000127
- GB 9903638 A 19990217
Abstract (en)
[origin: WO0049364A1] An interferometer (1) is arranged to form a first interference fringe pattern comprising at least ten interference fringes; recording an image of said first interference fringe pattern; perturbing an optical path in the interferometer (1) to form a second interference fringe pattern comprising at least ten interference fringes; and combining an image of said second interference fringe pattern with the recorded image of the first interference fringe pattern to produce a further image comprising a moiré fringe pattern arising from a difference or differences between the first and second interference fringe patterns. The combining step involves subtraction (4) of digital images. Different wavelengths and interferometers are used: Michelson, Mach-Zehnder, Fizeau, Twyman-Green. In this new approach, all the errors of a poor quality, misaligned system are accepted and then eliminated by the combination process, producing a moiré fringe pattern. The method enables very large aperture optical systems for traditional and engineering interferometers to be constructed from inexpensive and basic components.
IPC 1-7
IPC 8 full level
G01B 9/02 (2006.01); G01B 11/16 (2006.01); G01J 3/45 (2006.01)
CPC (source: EP US)
G01B 9/02032 (2013.01 - EP US); G01B 9/02087 (2013.01 - EP US); G01B 11/161 (2013.01 - EP US); G01J 3/45 (2013.01 - EP US)
Citation (search report)
See references of WO 0049364A1
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 0049364 A1 20000824; AT E284527 T1 20041215; CA 2336942 A1 20000824; CA 2336942 C 20070327; DE 60016573 D1 20050113; DE 60016573 T2 20051208; EP 1153263 A1 20011114; EP 1153263 B1 20041208; GB 9903638 D0 19990407; JP 2002537550 A 20021105; NO 20006355 D0 20001213; NO 20006355 L 20010215; US 6744517 B1 20040601
DOCDB simple family (application)
GB 0000236 W 20000127; AT 00901234 T 20000127; CA 2336942 A 20000127; DE 60016573 T 20000127; EP 00901234 A 20000127; GB 9903638 A 19990217; JP 2000600058 A 20000127; NO 20006355 A 20001213; US 71921501 A 20010226